Bumping-screen.



PATENTED AUG. 4, 1903.

H. L. KING.

BUMPING SCREEN.

APPLICATION FILED NOV. 8, 1902.

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No. 735,525. PATENTED AUG. 4, 1903. H. L. KING.

BUMPING SCREEN.

APPLICATION FILED NOV. 2, 1902.

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PATENT OFFICE.

HARRY L. KING, OF DENVER, COLORADO.

BUMPING-SCREEN.

SPECIFICATION forming part of Letters Patent N 0. 735,525, dated August 4, 1903.

Application filedNovember 8, 1902. Serial No. 130,570. (N model.)

To all whom, it may concern:

Be it known that I, HARRY LEALAND KING, residing at Denver, in the county of Arapahoe and State of Colorado, have invented a new and Improved Bumping-Screen, of which the following is a specification.

This invention is in the nature of an improved bumping-screen for classifying and sizing ores in milli g"; and it comprehends generally a separate or main frame, a screen or separator, anda peculiarly-arranged means for hanging said screen or separator, whereby when the said screen is moved forward toward the bumpers a slight vertical movement is imparted thereto whereby to free the screenmesh of adhering particles, which otherwise would remain lodged.

In its more complete nature my invention includes, in connection with the supportingframe, the screen-hangers located below the weight of the screen-body and so disposed relatively to the main frame and the screen whereby a vertical rolling movement of the screen is effected simultaneously with the longitudinal movement or thrust thereof.

Again, my invention embodies a simple, strong, and suitable construction of parts especially designed to withstand the shocks caused by the cam engaging the screen-body to move it in one direction and the impact of the said body in a reverse direction under a spring force against the bumpers; and in its still more subordinate features this invention consists in certain details of construction and peculiar combination of parts, all of which will be fully described, and specifically pointed out in the appended claims, reference being had to the accompanying drawings, in which- 1 Figure 1 is a side elevation of myinvention. Fig.2 is a plan view thereof. Fig. 3 is a longitudinal section of the same on the line 3 3 of Fig. 2. Fig. 4 is an end view of the upper part. Fig. 5 is a cross-section taken through the cam-operating shaft, and Fig. 6 is a plan *view of the screen.

In carrying out my invention I provide a suitable supporting or main frame, which includes a pair of longitudinally extending horizontal side beams 1 1, joined at the outer or feed end of the machine by a cross-bar 2, at the front end by a stout cross-bar 3, and

at a point midway the bars 2 and 3 by cross member 4, as best shown in Fig. 2. At the outer end of the beams l 1 are secured a pair of vertically-extendingsheet-metal straps 5 5, whose upper ends are bent inward, as at 5 5, to support a hopper or guide 6. (See Figs. 1 and 4..)

7 designates the screen or shaker body, the construction of which is best shown in Fig. 2, and same is of a rectangular shape and formed of side bars 7*,an end member 7", a central cross-brace 7 and screen-supporting braces 7, which divide the screening-cloth into a series of longitudinal divisions. A screen-cloth 8 is made fast to the upper side of the braces '7 in any Well-known manner.

9 designates a sheet-metal guard consisting of parallel members 9 and upper and lower end portions 9? and 9. The guard 9 also serves as a receiver to hold the auriferous material on the screen and from being thrown off during the operation of screening, and the said guard and receiver is mounted upon the incline side bars 7 of the screen-frame, as clearly shown in Fig. 1.

The screen-holding frame is supported at the front and rear ends upon members 10 10 and 11 11, which are made of tough springy wood, preferably of oak or hickory, and the members 10, which form standards, are made fast to vertical extensions 7 secured to the front end of the screen-holding frame, and

the'members 11 11 are joined at their upper ends to the'frame or head portion of the screenbody, the lower ends of which extend downwardly and are fixedly secured to the front edge of the cross member 2 of the main frame, as clearly shown in Fig. 3; The rear or head end of the screenframeengages a buder device which consists of aibraoket 12,1nounted on the cross-bar 2,in the upper end of which is adju-stably mounted a rod 13, that projects inwardly, is threaded, andcarries an adj usting-nut 15 for regulating the tension of the buffer-spring 14, mounted on the rod 13 and held in contact with the head end of the screen-frame,'which has a guide-stud for supporting the inner end of'the'spring 14. (See Fig. The standards 10 10 project below the screen-frame (see Fig. 1) and are made fast to the brackets 17 17,pendently secured to the under edge of the side beams 1 1.

At a suitable point in advance of the lower end of the screen-frame is journaled an operating-shaft 18, mounted transversely on the main frame in the bearing-boxes 19 19 on the side beams 1 1, and at a point midway thereof the shaft 18 has fixedly secured thereto a cam O, which cooperates with the screen-frame and is of such shape as to intermittently engage a solid or abutment portion 7 of the lower end of the screen and at predetermined times permit the said screen being forced inwardly under the pressure or tension of the spring let and the bars 1] to force the said abutment-piece 7 into a quick engagement with the bumpers 20 20, (see Fig. 2,) and thereby effect the desired shocking or jarring of the screen.

21 22 designate the sheet-metal catch-pans secured to the under side of the screen to collect the drippings from the said screen.

From the foregoing, taken in connection with the accompanying drawings, it is believed the general construction,the operation, and the advantages of my invention will be readily apparent to those skilled in the art to which it appertains.

As clearly shown in Figs. 1 and 3,1ongitudinal motion is imparted to the screen in one direction by the drive-shaft 18, which is equipped with a fast and a loose pulley, as shown, by reason of the cam C intermittently engaging the abutment-piece '7 of the lower end of the screen, said cam serving to force the screen-body 1 in a diagonally forward and outward direction. By reason of the peculiar relation of the free ends of the springbars 11 with the cross member 2 of the main frame and the spring-standards 10 when the cam ceases its pushing action against the screen-frame the combined spring action of the spring 14, the bars 11, and the standards 1 0 serves to thrust the screen-body quickly forward to cause its abutment member 7 to engage the bumpers 20 20 with great force, sufficient to dislodge any particles that may tend to adhere to the under side of the screen-cloth. Thus in the use of my apparatus water cannot follow the under side of the screen, as commonly occurs in other well-known apparatus of this type, in which the water usually flows on the under side of the screen and in consequence thereof when a screen of very fine mesh is used clogs up the screen and obstructs the separation of the fine material from the auriferous mass. In my apparatus the motion of the screen-bodyis also slightly upward,as well as forward,when itapproaches the bumpers, and though the upward movementisslightitis suflicienttoovercome the attraction that otherwise holds the water on the under side of the screening-cloth. Experience has demonstrated that the rearward straight movement of the screen alone will cause the water to drop off the bottom of a screening-cloth, as a screen having that motion only must have sufficient pitch to advance the material being sized, and that pitch generally causes the water to follow the under side of the screening-cloth. This objectionable feature I positively overcome by hanging the screen in the manner shown and described and forcing it against the bumpers by a quick, positive, and decisive bumping action and the number of bumps that I am enabled to obtain in a given time through the cam and spring devices which cooperate with the screen, which operation in my construction of apparatus is accomplished without injury to the machine, said operation being a very ad vantageous feature of my invention.

My apparatus is especially adapted for use either in wet or dry milling and serves as a convenientsubstitute for the hydraulic means frequently employed for the same purpose.

Slight changes in the details and combination of parts may be readily made without departing from the scope of the appended claims.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. In a bumping-screen the combination with the main frame, including the cross-bar 2, the operating-shaft, the cam O mounted thereon, and the bumpers 20 20, substantially as shown; of the screen-frame, the members 10 10 secured to the front end of the screenframe and projected below the said screenframe, brackets pendently secured on the main frame to which the lower end of the members 10 10 are secured, a central guide and support for the rear end of the screenframe, upon which the frame has a sliding movement, and the spring-bars 11 11 secured at their upper end to the rear end of the screen-frame, their lower ends being free to ext-end in close proximity to the cross-bar 2, for the purposes specified.

2. In a bumping-screen as described; the combination with the main frame including the side bars 1 l and the cross-bars 2, the transversely-disposed shaft 18 journaled on the bars 1 1, the cam O on the shaft, bumpers 2O 20 on the main frame, and the pendent brackets 17 17; on the screen-frame a screen mounted thereon, said frame having vertical extensions on the lower end, spring members 10 10 secured at the upper end to the said extensions and at the lower end to the brackets 12, the said screen-frame including an abutment-piece 7, 9. centrally-disposed bracket mounted on the cross-bar 2, a forwardly-extending rod carried on the upper end of the said bracket and loosely projected through the upper end of the said screen-frame, and a bufier-spring on said rod substantially as shown and described.

HARRY L. KING.

Witnesses:

WM. H. CARPENTER, JOHN O. RUSSELL. 

